circuitpython/shared-bindings/memorymap/AddressRange.c

239 lines
10 KiB
C

/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/binary.h"
#include "py/runtime.h"
#include "py/runtime0.h"
#include "shared-bindings/memorymap/AddressRange.h"
//| class AddressRange:
//| r"""Presents a range of addresses as a bytearray.
//|
//| The addresses may access memory or memory mapped peripherals.
//|
//| Some address ranges may be protected by CircuitPython to prevent errors.
//| An exception will be raised when constructing an AddressRange for an
//| invalid or protected address.
//|
//| Multiple AddressRanges may overlap. There is no "claiming" of addresses.
//|
//| Example usage on ESP32-S2::
//|
//| import memorymap
//| rtc_slow_mem = memorymap.AddressRange(start=0x50000000, length=0x2000)
//| rtc_slow_mem[0:3] = b"\xcc\x10\x00"
//|
//| Example I/O register usage on RP2040::
//|
//| import binascii
//| import board
//| import digitalio
//| import memorymap
//|
//| def rp2040_set_pad_drive(p, d):
//| pads_bank0 = memorymap.AddressRange(start=0x4001C000, length=0x4000)
//| pad_ctrl = int.from_bytes(pads_bank0[p*4+4:p*4+8], "little")
//| # Pad control register is updated using an MP-safe atomic XOR
//| pad_ctrl ^= (d << 4)
//| pad_ctrl &= 0x00000030
//| pads_bank0[p*4+0x3004:p*4+0x3008] = pad_ctrl.to_bytes(4, "little")
//|
//| def rp2040_get_pad_drive(p):
//| pads_bank0 = memorymap.AddressRange(start=0x4001C000, length=0x4000)
//| pad_ctrl = int.from_bytes(pads_bank0[p*4+4:p*4+8], "little")
//| return (pad_ctrl >> 4) & 0x3
//|
//| # set GPIO16 pad drive strength to 12 mA
//| rp2040_set_pad_drive(16, 3)
//|
//| # print GPIO16 pad drive strength
//| print(rp2040_get_pad_drive(16))
//| """
//| def __init__(self, *, start, length) -> None:
//| """Constructs an address range starting at ``start`` and ending at
//| ``start + length``. An exception will be raised if any of the
//| addresses are invalid or protected."""
//| ...
STATIC mp_obj_t memorymap_addressrange_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
enum { ARG_start, ARG_length };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_start, MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_length, MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_INT },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// Argument start is a pointer into the address map, so we validate it here because a
// signed int argument will overflow if it is in the upper half of the map.
size_t start;
if (mp_obj_is_small_int(args[ARG_start].u_obj)) {
start = MP_OBJ_SMALL_INT_VALUE(args[ARG_start].u_obj);
} else if (mp_obj_is_exact_type(args[ARG_start].u_obj, &mp_type_int)) {
start = mp_obj_int_get_uint_checked(args[ARG_start].u_obj);
} else {
mp_obj_t arg = mp_unary_op(MP_UNARY_OP_INT_MAYBE, args[ARG_start].u_obj);
start = mp_obj_int_get_uint_checked(arg);
}
size_t length =
mp_arg_validate_int_min(args[ARG_length].u_int, 1, MP_QSTR_length);
// Check for address range wrap here as this can break port-specific code due to size_t overflow.
if (start + length - 1 < start) {
mp_raise_ValueError(MP_ERROR_TEXT("Address range wraps around"));
}
memorymap_addressrange_obj_t *self = mp_obj_malloc(memorymap_addressrange_obj_t, &memorymap_addressrange_type);
common_hal_memorymap_addressrange_construct(self, (uint8_t *)start, length);
return MP_OBJ_FROM_PTR(self);
}
//| def __bool__(self) -> bool: ...
//| def __len__(self) -> int:
//| """Return the length. This is used by (`len`)"""
//| ...
STATIC mp_obj_t memorymap_addressrange_unary_op(mp_unary_op_t op, mp_obj_t self_in) {
memorymap_addressrange_obj_t *self = MP_OBJ_TO_PTR(self_in);
uint16_t len = common_hal_memorymap_addressrange_get_length(self);
switch (op) {
case MP_UNARY_OP_BOOL:
return mp_obj_new_bool(len != 0);
case MP_UNARY_OP_LEN:
return MP_OBJ_NEW_SMALL_INT(len);
default:
return MP_OBJ_NULL; // op not supported
}
}
STATIC const mp_rom_map_elem_t memorymap_addressrange_locals_dict_table[] = {
};
STATIC MP_DEFINE_CONST_DICT(memorymap_addressrange_locals_dict, memorymap_addressrange_locals_dict_table);
//| @overload
//| def __getitem__(self, index: slice) -> bytearray: ...
//| @overload
//| def __getitem__(self, index: int) -> int:
//| """Returns the value(s) at the given index.
//|
//| 1, 2, 4 and 8 byte aligned reads will be done in one transaction
//| when possible.
//| All others may use multiple transactions."""
//| ...
//| @overload
//| def __setitem__(self, index: slice, value: ReadableBuffer) -> None: ...
//| @overload
//| def __setitem__(self, index: int, value: int) -> None:
//| """Set the value(s) at the given index.
//|
//| 1, 2, 4 and 8 byte aligned writes will be done in one transaction
//| when possible.
//| All others may use multiple transactions."""
//| ...
//|
STATIC mp_obj_t memorymap_addressrange_subscr(mp_obj_t self_in, mp_obj_t index_in, mp_obj_t value) {
if (value == MP_OBJ_NULL) {
// delete item
// slice deletion
return MP_OBJ_NULL; // op not supported
} else {
memorymap_addressrange_obj_t *self = MP_OBJ_TO_PTR(self_in);
if (0) {
#if MICROPY_PY_BUILTINS_SLICE
} else if (mp_obj_is_type(index_in, &mp_type_slice)) {
mp_bound_slice_t slice;
if (!mp_seq_get_fast_slice_indexes(common_hal_memorymap_addressrange_get_length(self), index_in, &slice)) {
mp_raise_NotImplementedError(MP_ERROR_TEXT("only slices with step=1 (aka None) are supported"));
}
if (value != MP_OBJ_SENTINEL) {
#if MICROPY_PY_ARRAY_SLICE_ASSIGN
// Assign
size_t src_len = slice.stop - slice.start;
uint8_t *src_items;
if (mp_obj_is_type(value, &mp_type_array) ||
mp_obj_is_type(value, &mp_type_bytearray) ||
mp_obj_is_type(value, &mp_type_memoryview) ||
mp_obj_is_type(value, &mp_type_bytes)) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(value, &bufinfo, MP_BUFFER_READ);
if (bufinfo.len != src_len) {
mp_raise_ValueError(MP_ERROR_TEXT("Slice and value different lengths."));
}
src_len = bufinfo.len;
src_items = bufinfo.buf;
if (1 != mp_binary_get_size('@', bufinfo.typecode, NULL)) {
mp_raise_ValueError(MP_ERROR_TEXT("Array values should be single bytes."));
}
} else {
mp_raise_NotImplementedError(MP_ERROR_TEXT("array/bytes required on right side"));
}
common_hal_memorymap_addressrange_set_bytes(self, slice.start, src_items, src_len);
return mp_const_none;
#else
return MP_OBJ_NULL; // op not supported
#endif
} else {
// Read slice.
size_t len = slice.stop - slice.start;
uint8_t *items = m_new(uint8_t, len);
common_hal_memorymap_addressrange_get_bytes(self, slice.start, len, items);
return mp_obj_new_bytearray_by_ref(len, items);
}
#endif
} else {
// Single index rather than slice.
size_t index = mp_get_index(self->base.type, common_hal_memorymap_addressrange_get_length(self),
index_in, false);
if (value == MP_OBJ_SENTINEL) {
// load
uint8_t value_out;
common_hal_memorymap_addressrange_get_bytes(self, index, 1, &value_out);
return MP_OBJ_NEW_SMALL_INT(value_out);
} else {
// store
mp_int_t byte_value = mp_obj_get_int(value);
mp_arg_validate_int_range(byte_value, 0, 255, MP_QSTR_bytes);
uint8_t short_value = byte_value;
common_hal_memorymap_addressrange_set_bytes(self, index, &short_value, 1);
return mp_const_none;
}
}
}
}
MP_DEFINE_CONST_OBJ_TYPE(
memorymap_addressrange_type,
MP_QSTR_AddressRange,
MP_TYPE_FLAG_NONE,
make_new, memorymap_addressrange_make_new,
locals_dict, (mp_obj_t)&memorymap_addressrange_locals_dict,
subscr, memorymap_addressrange_subscr,
unary_op, memorymap_addressrange_unary_op
);